I buy this universal theme with the hope that my worry is over but each time i create a new page or adjust things, my site just went blank for more than five times such that i had to restore backup before i could work again.

i am not impress with is theme, or what is it i am doing wrong? even on my localhost machine its the same thing. for instance, i tried to install the dummy data, it stop at 65% and never continued for more than one hour and when i decided to stop it the site went blank.